Diaphragm for dialysers



Feb. 1s, 1941.

H. voHRER DIAPHRAGM FOR DIALYSERS Filed Nov. 23, 1958'l )Jaar/'ng a candzav'i' @Zim/ei Parenteel Feb. is, 1941 2,232,153

UNITED STATES PATENT OFFICE DIAPHRAGM FOR DIALYSERS Herbert Vohrer, Berlin, Germany Application Noyember 23, 1938, Serial No. 242,126 In Germany November 25, 1937 7 Claims. (Cl. 23-252) My invention relates to dialysers for removing water or aqueous solutions, this swelling being organic colloidal impurities from salt selections, more or Eless intense according to the grade of particularly from strong alkaline lyes, as, used polymerisation of the vinyl composition in quesfor example, in the production of artificial silk, tion. The resistance of the polymerized vinyl and m-ore particularly to the diaphragms or compositions lto water can be increased to any dialysing chambers of such dialysers as well as to desired degree by methods well known in .the art, the inlet and outlet conduits for the lye. for example, by treating them by sodium bi- The diaphragms of such dialysers are usually chromate or any other tanning agent, or by heatm-ade from pergament or from cotton fabric ing them -to about 170 C. treated with an alkali, whereas the inlet and out- The dialyser diaphragms or chambers accord- 10 let conduits for the lye consist of rubber hose. It ing .to the invention may consist of films made has been found lthat the efllciency of dialysers from the above mentioned material, either alone, provided with such diaphragme is not very good, (Eig. 1) or applied to a wire net or a woven fabric and that, besides, the life of such diaphragms is made from any vegetable fiber (Fig. 2). rather short. The same is true of the inlet and An important advantage of the diaphragms acoutlet conduits for .the lye, and besides, leakages cording to the invention consists in that .they are often happening at the connection points of enable to produce dialyser chambers in a very the conduits to the dialyser chambers. simple manner. Whereas hitherto such cham- The object of the invention is to increase the bers had to be made rby sewing pieces of fabric eiilciency and to lengthen the life of dialyser diatogether, now it is possible to make the chambers 20 phragms and dialyser chambers made from such by simply sticking together ilms or plates condiaphragms. sisting of a polymerized vinyl composition with Another object of the invention is to provide a the aid of an aqueous solution of the same matedialyser in which the diaphragm forming the rial.

walls of the dialysing chambers and the inlet and The inlet and outlet conduits for the lye can be 25;y outlet conduits for the lye are made from one and made from the same material as .the dialyser the same material so that the conduits can be chambers, (Fig. 3) and theycan also be conconnected to the said chambers in a very simple nected -to these chambers by sticking.

manner by sticking, this connection being so se- Having now particularly described and ascercure and durable as to practically eliminate the tained the nature of my said invention and in 3,- possibility of leakages. what manner the same is .to be performed, I

Further objects and advantages of the nvendeclare that wha-tI claim is: tion will appear more fully from the following 1. In a. dialyser, a dialysing diaphragm comdescription, particularly when .taken in conjuncprising a highly polymerized vinyl composition. tion with the accompanying drawing which forms 2. In a dialyser, a dialysing diaphragm coma part thereof. prising polyvinyl chloride.

In the drawing: 3. In a dialyser, a dialysing diaphragm com- Fig. 1 shows in side elevation a form of diaprising polyvinyl ether. phragm embodying the invention; 4. In a dialyser, a dialysing diaphragm com- 0 Fig. 2 is a similar view of a modified form .of prising a highly polymerized polyvinyl alcohol. 40 the invention; 5. In a dialyser, a dialysing diaphragm com- Fig. 3 is a transverse section through a further prising a tanned polymerized vinyl composition. modification of the invention. 6. In a dialyser, a dialysing diaphragm com- According to the invention the dialysers are prising a wire net having a illm of a polymerized provided with diaphragms consisting of a polyvinyl composition attached thereto. 45

merized vinyl compositio such as polyvinyl '1. In a dialyser, a dialysing diaphragm comc'hloride, polyvinyl ether, and highly polymerprising a woven fabric of vegetable bers and a ized vinyl alcohols insoluble in cold water. The film of polymerized vinyl composition attached polymerized vinyl compositions are particularly thereto. adapted for the purpose because of .their resist- HERBERT VOHRER. ggg

ance to alkalies and their property to swell in 

